JPS616541A - Solar heat collection device - Google Patents

Abstract

PURPOSE:To reduce the lowering of performance depending upon the flow direction of natural wind and consequently increase the amount of collected heat quantity and improve the running efficiency of a system by a constitution wherein a heat collector is composed of finned tube type, which consists in arranging a large number of fins, the leading edge and trailing edge of each of which are formed in alternately indented forms, so that the indentation of the leading edge and trailing edge of one fin is opposite to that of another fin alternately onto refrigerant tubes. CONSTITUTION:A heat collector is composed of finned tube type, which consists in arranging a large number of fins 4d, the leading edge and trailing edge of each of which are formed in alternately indented forms, so that the indentation of the leading edge and trailing edge of one fin is opposite to that of another fin alternately onto refrigerant tubes 4b in order to absorb the solar heat and the atmospheric heat, resulting in evaporating and gasifying refrigerant. Even due to the winds having the directions A and B respectively, the breakdown of boundary layers and the disturbance of flow by the pressure difference are produced and induced air flows are developed between the fins 4d, resulting in improving the air side heat transfer rate, increasing the amount of absorbed atmospheric heat and the running efficiency of a system. Further, even in winter, in which the outside air temperature is low, the frosting occurs not only at the tip of the fin 4a but also down to the root of the fin 4a, resulting in reducing the thickness of frosting at the tip of the fin 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat collecting device that uses a heat pump to absorb solar heat and atmospheric heat to produce hot water.

Conventional Structure and Problems Conventionally, as shown in FIG. 4, a compressor 1. Condenser 2. Expansion device 3, heat collector 4. Gas-liquid separators 6 are successively connected to form a refrigerant closed circuit, solar heat and atmospheric heat are absorbed by the heat collector 4, and the condensation heat obtained by adding the compression heat of the compressor 1 to the absorbed heat is used to generate hot water. There is a solar heat collection device that creates hot water and stores it in a hot water storage tank 7. As shown in FIG. 1, the structure of the heat collector 4 in this solar heat collecting device is a flat plate type in which a refrigerant pipe 4b is joined to a heat collecting plate 4a.

However, in this heat collector 4, since the air-side heat transfer area is smaller than the solar heat receiving area, it cannot absorb enough atmospheric heat on cloudy or rainy days, resulting in insufficient heat collection. Furthermore, the operating efficiency of the system is also poor. On the other hand, in order to overcome the insufficient amount of heat collected and to improve operational efficiency, there is another heat collector configuration, as shown in FIG. 2, of a fin-tube type in which a large number of fins 4c of the same specification are arranged on a refrigerant pipe 4b. In this case, the heat transfer area on the air side is large, so the amount of heat collected and the operating efficiency are significantly improved.

However, since it uses outdoor natural wind to absorb atmospheric heat, its performance changes considerably depending on the direction of the natural wind. As shown by the solid line in FIG. 2, it is sufficient if the wind direction passes between the fins 40, but if the wind direction is such that it is difficult to pass between the fins 40, as shown by the broken line, the velocity boundary layer is thick on the surface of the fins 40, and the air Performance is considerably inferior due to poor side heat transfer coefficient. Also, in winter when the outside temperature is low and the natural wind speed is low (natural convection),
As shown in Fig. 3, frost forms on the tips of the fins 4C, and as time passes, the frost progresses and the space between the fins 40 becomes clogged, resulting in a significant decrease in heat absorption, deterioration of operating efficiency, and This also causes a liquid back-up to 1, which poses a problem in terms of equipment reliability.

Purpose of the Invention The present invention solves the above-mentioned problems such as insufficient heat collection amount and system efficiency.
This improves the reliability of equipment.

Structure of the Invention In order to achieve the above object, the present invention provides a refrigerant closed circuit in which a compressor, a condenser, an expansion device, a heat collector, and a gas-liquid separator are successively connected, and a water heating circuit having a heat exchange relationship with the condenser. It consists of a hot water supply circuit consisting of a water heater, a hot water storage tank, and a water circulation pump. By adopting a fin-tube type configuration with multiple arrays arranged so that It is possible to increase the amount of heat collected by lengthening the operating time during which the fins become clogged.

DESCRIPTION OF THE EMBODIMENTS The following describes embodiments based on the drawings. FIG. 4 shows an embodiment of the solar heat collecting device of the present invention, and FIG. 5 shows an embodiment of the heat collector of the solar heat collecting device of the present invention. In FIGS. 4 and 5, 1 is a compressor, and 2 is a condenser, which performs the function of condensing the refrigerant. 3 is an expansion device, 4 is a heat collector, and the 6th
As shown in the figure, the refrigerant pipe 4b has a fin tube configuration in which a large number of fins 4d whose front and trailing edges are alternately uneven are arranged so that the unevenness of the leading and trailing edges are alternately reversed.
It absorbs solar heat and atmospheric heat to evaporate and gasify the refrigerant.

6 is a gas-liquid separator. Moreover, the compressor 1. Condenser 2.
Expansion device 3. Heat collector 4. The gas-liquid separators 5 are connected in sequence to form a refrigerant closed circuit. 6 is a water heater, which has a heat exchange relationship with the condenser 2. 7 is a hot water storage tank, 8 is a water circulation pump, and the water heater 6. Hot water tank7. The water circulation pumps 8 are connected to form a hot water supply circuit.

Next, the effect will be explained. The high-temperature, high-pressure superheated refrigerant gas compressed by the compressor 1 flows into the condenser 2, where it is cooled by the water sent from the water circulation pump 8 and is condensed and liquefied. Heat to raise temperature. or,
The condensed and liquefied refrigerant flows into the expansion device 3, is depressurized, flows into the heat collector 4, absorbs solar heat and atmospheric heat, evaporates into gas, and returns to the compressor 1. Here, the heat collector 4 is the refrigerant pipe 4b
Since a large number of fins 4d whose front and rear edges are alternately uneven are arranged so that the unevenness of the front and rear edges are alternately reversed, each wind direction in the direction and the direction of B in FIG. As shown in Fig. 6(a) and (b), turbulence due to boundary layer destruction and differential pressure occurs, and induced airflow occurs between the fins 4d, improving the air side heat transfer coefficient and increasing the amount of atmospheric heat absorbed. This also improves the operating efficiency of the system. Also, even at low outside temperatures in winter,
As shown in FIG. 7, frosting occurs not only at the tips of the fins 4d but also at the bases of the fins 4d, so that with the same amount of frosting as before, the thickness of frosting at the tips of the fins 4d will be smaller. In addition, the fin pitch at the tip of the fin 4d is apparently 42 times larger than before, so frosting progresses and the pitch of the fin 4d increases.
The time required to reach the point where the tip becomes clogged and the amount of heat absorbed suddenly decreases is doubled. Therefore, the amount of heat collected increases significantly by increasing the heat collection operation time. Also, problems such as liquid back up to the compressor are reduced.

Effects of the Invention As described above, the present invention provides a compressor, a condenser, an expansion device,
The refrigerant closed circuit is composed of a refrigerant closed circuit in which a heat collector and a gas-liquid separator are sequentially connected, and a hot water supply circuit in which a water heater having a heat exchange relationship with the condenser, a hot water storage tank, and a water circulation pump are connected, and the refrigerant closed circuit is In a solar heat collecting device that collects solar heat and atmospheric heat in the heat collector using a heat pop cycle to produce hot water and stores it in the hot water storage tank, the heat collector is configured such that the leading edge and the trailing edge are arranged in refrigerant tubes alternately. By using a fin-tube type structure in which a large number of uneven fins are arranged so that the unevenness of the leading and trailing edges are alternately reversed, it is possible to create turbulent natural wind on the fin surface and air conditioning flow between the fins. In addition to improving the heat transfer coefficient on the air side, the amount of heat collected is also increased by increasing the time during which clogging occurs between the fins, and so-called heat collection operation time, even in the case of frost formation that occurs at low outside temperatures in winter. , the operating efficiency of the system can be improved.

Furthermore, the amount of liquid banked to the compressor is reduced, and the reliability of the equipment can also be improved.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views showing the collector of a conventional solar heat collecting device, Figure 3 is a diagram showing the frosting state of the conventional collector, and Figure 4 is a diagram showing the solar heat collector of the present invention. A system diagram showing an embodiment of the heat collecting device; Fig. 5 is a perspective view showing an embodiment of the heat collecting device used in the solar heat collecting device of the present invention; Fig. 6 a, l)
7 is a diagram showing the flow of wind in the heat collector used in the solar heat collecting device of the present invention, and FIG. 7 is a diagram showing the frosting state of the heat collector used in the solar heat collecting device. 1... Compressor, 2... Condenser, 3...
- Expansion device, 4... Heat collector, 4a... Refrigerant pipe, 4b
... Heat collection plate, 4C-・Fin, 4d...Fin, 5... Gas-liquid separator, 6... Water heater, 7... Hot water storage tank, 8... Water circulation pump . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A refrigerant closed circuit that sequentially connects a compressor, a condenser, an expansion device, a heat collector that collects solar heat and atmospheric heat, and a gas-liquid separator;
It consists of a hot water supply circuit that connects a water heater, a hot water storage tank, and a water circulation pump that have a heat exchange relationship with the condenser. and a solar heat collecting device with a fin-tube type configuration in which a large number of protrusions and convexities on the trailing edge are arranged in reverse order.